1. Go to this page and download the library: Download mlocati/ocsp library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
$certificateLoader = new \Ocsp\CertificateLoader();
$certificate = $certificateLoader->fromFile('/path/to/certificate');
$certificateInfo = new \Ocsp\CertificateInfo();
$urlOfIssuerCertificate = $certificateInfo->extractIssuerCertificateUrl($certificate);
$certificateLoader = new \Ocsp\CertificateLoader();
$certificate = $certificateLoader->fromFile('/path/to/certificate');
$certificateInfo = new \Ocsp\CertificateInfo();
$ocspResponderUrl = $certificateInfo->extractOcspResponderUrl($certificate);
$certificateLoader = new \Ocsp\CertificateLoader();
$certificateInfo = new \Ocsp\CertificateInfo();
$ocsp = new \Ocsp\Ocsp();
// Load the HTTPS certificate and the issuer certificate
$certificate = $certificateLoader->fromFile('/path/to/certificate');
$issuerCertificate = $certificateLoader->fromFile('/path/to/issuer/certificate');
// Extract the relevant data from the two certificates
$requestInfo = $certificateInfo->extractRequestInfo($certificate, $issuerCertificate);
// Build the raw body to be sent to the OCSP Responder URL
$requestBody = $ocsp->buildOcspRequestBodySingle($requestInfo);
// Actually call the OCSP Responder URL (here we use cURL, you can use any library you prefer)
$hCurl = curl_init();
curl_setopt($hCurl, CURLOPT_URL, $ocspResponderUrl);
curl_setopt($hCurl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($hCurl, CURLOPT_POST, true);
curl_setopt($hCurl, CURLOPT_HTTPHEADER, ['Content-Type: ' . \Ocsp\Ocsp::OCSP_REQUEST_MEDIATYPE]);
curl_setopt($hCurl, CURLOPT_SAFE_UPLOAD, true);
curl_setopt($hCurl, CURLOPT_POSTFIELDS, $requestBody);
$result = curl_exec($hCurl);
$info = curl_getinfo($hCurl);
if ($info['http_code'] !== 200) {
throw new \RuntimeException("Whoops, here we'd expect a 200 HTTP code");
}
if ($info['content_type'] !== \Ocsp\Ocsp::OCSP_RESPONSE_MEDIATYPE) {
throw new \RuntimeException("Whoops, the Content-Type header of the response seems wrong!");
}
// Decode the raw response from the OCSP Responder
$response = $ocsp->decodeOcspResponseSingle($result);